So.. Dave Grohl of Foo Fighters and Nirvana fame basically, practically solo produced an extreme metal album, mixing all sorts of genres from sludge, black, doom, heavy, thrash, and even alternative metal plus some punk on top of that. He definitely took the kitchen sink approach lol. It's not all that bad either! Linked is the single of the self titled album with a faster tempo and some catchy riffs.
Tidal, RateYourMusic, Encyclopaedia Metallum
There is a Bandcamp, but features no info nor does it contain this release.
EDIT: ok so It turns out this "band" was created for a movie called Studio 666, which is a comedy horror starring the Foo Fighters and has a bunch of this album's music as part of the soundtrack lol.